Electric circuit



y 31,1945; w. N. OLSON ,3 ,8

Q ELECTRIC CIRCUITS Filed Maroh 20, 1944 *18 [NI/ENTJE ATTJAWEY ence tothe accompanying drawing forming a'part rendered inoperative and switchll automatically tion of rest or non-use; a control circuit, whereuponthe operation. will be .the circuits; 2o closed, the current supplied tothe control circuit Figs. 1; 2 and 3 comprises a main electric circuitsubstantially constant voltage in the control cirin parallel, a mcut-out I! as indicated. Aby- 1n the modification illustrated in Fig. 4,a stop includes a normally pen switch I! operable by is arranged tooperate said switch as indicated;

Patented July 31, 1.945 2,380,865

UNITED s'rA'l'as PATENT orrlca accuses Waldemar N. or... Brookfleld,nl.. assignor to Reynolds Electric 00., Chicago, 111., a corporation ofIllinois Application March 20,1944, Serial No. 521,210 '1 Claims. (Cl.315-120) The invention relates to improvements in elecalmost immediatelyafter the supplying oi curtric circuits for supplying an electriccircuit with rent to the main circuit. As soon as the switch asubstantially constant voltage from an electric i1 closes, the chokecoil I3 is by-passed, thus percircuit of variable voltage. the primaryobject of mitting .sufiicient current to flow thro h he the inventionbeing the provision of a system of 5 lamp I to l ght the same, and thearrangement is circuits for the purpose which. are of simple consuch asto maintain a substantially constant voltstruction and highly eiiicientin use. age through said lamp as long as the switch I! Other objectswill appear hereinafter. is held closed by the magnet I8. Continued flowThe invention consists of the combinations and of current through thethermostatic switch 20, arrangements of parts hereinafter described andhowev r. heats d switch fl ciently to cause it claimed. to open after apredetermined time, as indicated- Theinvention will be best understoodby reierin Fig. 3, whereupon the electro-ma net I 8 is of thisspecification and in whichopens, thus in due course restoring the partsto Fig. 1 is a diagrammatic view illustrating cir- .15 the positionsshown in Fig. 1 as soon as the thercuits embodying the invention andshown in posimostatic switch closes suihciently to close the Fig. 2, asimilar view showing the parts in th repeated at predetermined andregular intervals. position assumed immediately upon excitation of Aswill be noted, when the by-pass circuit is Fig.3. a similar view showingthe positions of I9 flows lthroughthe left-hand portion of the the partsassumed in th last stages of their opchoke coil I3 instead of throughthe right-hand eration; and portion thereof as when the switch I1 isopen. By Fig. 4, a diagrammatic view illustrating a modvarying the pointat which the control circuit I9 ifled form of construction orarrangement. taps the choke coil I3, the circuits may be varied Theembodiment of the invention illustrated in to meet varying conditions soas to maintain a II, such as a series street lighting circuit in which'cuit I9 during normal operations of the lamp I4, the cunent flow isnormally substantially conas will be readily understood by those skilledin stant, but the voltage varies in accordance with this art. The filmcutout-I5 serves to protect the variable conditions in said circuit. Atransformer parts in case the lamp II shouldburn out or beis connectedas indicated. to transmit energy come inoperativethus causing undue riseof voltto a branch circuit I2 which, in this instance, is age in thecircuit. Under such circumstances the a flash lamp circuit, andincludes, in series, a film cutout II will operate to by-pass the chokechoke coil l3 and an incandescent lamp I4 and, 85 coil and thus preventundue rise in voltage. a

pass circuit I8 is connected with said branch switch 22 is employed inthe control circuit II incircuit on opposite sides of said choke coiland stead of the thermostatic switch 20, and a cam a means of anelectro-magnet I8, as indicated. A 40 a I3 is ied by a cam shaft 24, o rcontrol circ II is tapped into the choke coil through gearing 25 fromthe motor shaft no: the 4'3 as indica and hasits other end connectedmotor and connected in and operated by the with the branch circuit 12,said control circuit incontrol. circuit As will e observed upon c108-cluding a thermostatic switch 20. A relay circuit ,ing of the maincircuit III, the motor 2'! will oper- II is connected with switch 20 andbranch cira to Then and close the switch 22, thus procuit I2 and controlcircuit I8 and includes the ducing the same effects in the branchcircuit I2 electro-magnet I8 of the switch I]. as indicated above andresulting in the periodic By this arrangement, when current is suppliedlighting of thelamp while maintaining a subto the main circuit I0, thebranch circuit I2 is stantially constant voltage in th control ir uitalso supplied with current through transformer I9, as will be readilyunderstood by those skilled I I, the parts then being in the positionshown in in this art. s 1'18. 1. Some current will thus pass from theWhile I have illustrated and described the'prechoke coil I3 to thecontrol circuit is and thence ferred forms of construction for carryingmy into relay circuit II, exciting the electro-magnet II vention intoeffect, these are capable of variatl and closing the switch I1, suchaction takin place, to and modification without departing from 2 I i0,000,0es

' branch circuit and a choke coil: a control circuit having one endtapped into said choke coil and connected at its cther'end with saidbranch circult; and means for utilizing said control circuit to maintaina substantially constant voltage in said control circuit.

2. The combination specified in claim 1 in which the main circuit is aseries street liahting circuit and the branch circuit is a flashing lampcircuit.

3. Th'e combination with a main variable voltage circuit. of a branchcircuit including a transformer transmitting energy from said main tosaid branch circuit and a choke cell; a by-pess circuit connected withsaid branch circuit on opposite sides oi said choke coil; acontrolcircuit having one end tapped into said choke coil and connectedat its other end with said branch circult; and a relay circuit connectedat its one end with said choke coil tap and connected at its other endwith said branch circuit.

specified in claim 8 in whichtbemaincircuitisaleriesstmetliahtimcircuizandthebranchcircuitisailashinglamp circui 8. The combination witha main to said branch circuit; a choke coil and an incandescent lamp inseries in said branch circuit; a

by-pass circuit connected with said branch circuit on mosite sides ofsaid choke coil: 0 normal open switch in said by-pass circuit; and acontrol circuit tappedintosaidchokecoilatoneendandconnectedatitsotherendwithsaidbranchcircuit and including means forperiodically open- 8 and closina Mid switch.

6. The combination specified -in claim 5 in which an electro-masnet isarranged to close said switch upon excitation; a thermostatic switch is20 included in the control circuit and arranged nor- 25 7. Thecombination spec-med in claim 5 in whichanelectricmotorisairahgedinsaidcontrol circuit to open and close said switch.

wawmn a. one'on.

